US6499648B2 - Method and device for making a metal bump with an increased height - Google Patents
Method and device for making a metal bump with an increased height Download PDFInfo
- Publication number
- US6499648B2 US6499648B2 US09/988,097 US98809701A US6499648B2 US 6499648 B2 US6499648 B2 US 6499648B2 US 98809701 A US98809701 A US 98809701A US 6499648 B2 US6499648 B2 US 6499648B2
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- metal
- metal bump
- making
- tubular member
- shaped chamber
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- 239000002184 metal Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title description 10
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims 2
- 230000008018 melting Effects 0.000 claims 2
- 229910000679 solder Inorganic materials 0.000 description 8
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/002—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating specially adapted for particular articles or work
- B23K20/004—Wire welding
- B23K20/005—Capillary welding
- B23K20/007—Ball bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/06—Solder feeding devices; Solder melting pans
- B23K3/0607—Solder feeding devices
- B23K3/0623—Solder feeding devices for shaped solder piece feeding, e.g. preforms, bumps, balls, pellets, droplets
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- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L24/10—Bump connectors ; Manufacturing methods related thereto
- H01L24/11—Manufacturing methods
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- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
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- H01L2224/10—Bump connectors; Manufacturing methods related thereto
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- H01L2224/113—Manufacturing methods by local deposition of the material of the bump connector
- H01L2224/1133—Manufacturing methods by local deposition of the material of the bump connector in solid form
- H01L2224/1134—Stud bumping, i.e. using a wire-bonding apparatus
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- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/12—Structure, shape, material or disposition of the bump connectors prior to the connecting process
- H01L2224/13—Structure, shape, material or disposition of the bump connectors prior to the connecting process of an individual bump connector
- H01L2224/13001—Core members of the bump connector
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- H01L2224/131—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof
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- H01L2224/42—Wire connectors; Manufacturing methods related thereto
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- H01L2224/451—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po), and alloys thereof
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- H01L2224/85—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector
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Definitions
- This invention is related to a method and device for making a metal bump with an increased height and in particular to one which can increase the connection reliability between the metal bump and the chip and enlarging the contact area between the metal bump and the metal or solder ball.
- the capillary tube 2 ′ is still the most commonly used tool for making metal stud bumps by means of wire bonding (see FIG. 1 A). As shown, the capillary tube 2 ′ has an inner diameter 21 ′ with an inner wall 22 ′ and has a larger diameter at the upper end than the lower end.
- a metal wire 3 ′ is inserted into the capillary tube 2 ′ and the lower end of the metal wire 3 ′ is melted to form a ball shaped member 31 ′ by electric spark. Then, ultrasonic vibration and pressure deformation processing are applied to the capillary tube 2 ′ to join the inter-metallic compounds between wire 3 ′ and the chip 1 ′ (see FIG. 1 B). When the capillary tube 2 ′ is removed, a metal bump 32 ′ will be formed on the raised platform 11 ′ of the chip 1 ′ (see FIG. 1 C). Thereafter; a metal or solder ball 4 ′ is soldered on the metal bump 32 ′.
- the metal bump 32 ′ will have a spherical surface which is insufficient to provide a large contact area and a reliable structure for joining other component parts. Furthermore, the bottom of the metal bump 32 ′ will tend to go beyond the lower opening of the capillary tube 2 ′ under pressure thereby making it difficult to control. Moreover; as the metal bump 32 ′ has a spherical surface, there will not be sufficient area in contact with a metal or solder ball 4 ′ (see FIG. 1 D).
- the metal bump 32 ′ is so short that the metal or solder ball 4 ′ must be soldered to the metal bump 32 ′ at a very low position thereby making it difficult to make the connection between the die and the fingers of a substrate (or lead frame, chips, metal bumps or the like) and therefore influencing the qualification rate of products.
- This invention is related to a method and device for making a metal bump with an increased height.
- FIG. 1A illustrates the lower end of the metal wire being melted to form a ball shaped member according to the prior art
- FIG. 1B illustrates the connection between the ball shaped member and the die according to the prior art
- FIG. 1C illustrates a metal bump according to the prior art
- FIG. 1D illustrates the connection between the metal bump and the metal or solder ball
- FIG. 2 is a sectional view of the capillary tube according to the present invention.
- FIG. 3A illustrates how the lower end of the metal wire is melted to form a ball shaped member according to the present invention
- FIG. 3B illustrates how the lower end of the metal wire is joined with the die according to the present invention
- FIG. 3C illustrates the metal bump according to the present invention.
- FIG. 3D illustrates the connection between the metal bump and the metal or solder ball according to the present invention.
- the high metal bump according to the present invention is manufactured by a hard conical tubular member 20 having a vertical conical passage 21 at the upper portion, a bell shaped chamber 23 at the lower portion which is larger than the vertical conical passage 21 in diameter, and which is located under and communicated with the vertical conical passage 21 , and a circular recess 231 which is larger than the bell shaped chamber 23 in diameter, and which is located under and communicated with the bell shaped chamber 23 , thereby forming a capillary tube 2 with a surface 22 .
- a metal wire 3 is inserted into the conical passage 21 of the hard conical tubular member 20 , with its lower end protruded down into the bell shaped chamber 23 . Then, the lower end of the metal wire 3 is melted to form a ball 31 . Then, the hard conical tubular member 2 is approached to a raised platform 11 formed on the top of a chip 1 , and the metal wire 3 is heated and bonded on the pad of die to melt and ultrasonic energy is applied to make the melted metal fill up the bell shaped chamber 23 , thereby forming a metal bump 32 on the platform 11 .
- the bottom of the metal bump 32 has a flange 321 formed by the circular recess 231 of the hard conical tubular member 2 .
- the cross sectional area of the metal bump 32 will be restricted by the bottom area of the bell shaped chamber 23 and the metal bump 32 will have a height equal to the height 232 of the bell shaped chamber 23 thereby increasing the joining capability between the metal bump 32 and the raised platform 11 of the semiconductor chip 1 and enlarging the contact area 33 between the metal bump 32 and the metal or solder ball 4 .
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- Engineering & Computer Science (AREA)
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- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Wire Bonding (AREA)
Abstract
A device for making metal bumps includes a hard conical tubular member having a vertical conical passage at an upper portion thereof, a bell shaped chamber at a lower portion thereof which is larger than the vertical conical passage in diameter, located under and communicated with the vertical conical passage, and a circular recess which is larger than the bell shaped chamber in diameter, located under and communicated with the bell shaped chamber, thereby forming a capillary tube with a surface.
Description
1. Field of the Invention
This invention is related to a method and device for making a metal bump with an increased height and in particular to one which can increase the connection reliability between the metal bump and the chip and enlarging the contact area between the metal bump and the metal or solder ball.
2. Description of the Prior Art
Various kinds of methods of making metal bumps on a chip have been developed for flip chip on board (FCOB) technology with a small number of input pins or a small number of Input/Output pins or for flip chip in package (FCIP) with a large number of Input/Output pins, such as evaporation plating, splash plating, electroplating, printing, spraying, and bonding. However, the capillary tube 2′ is still the most commonly used tool for making metal stud bumps by means of wire bonding (see FIG. 1A). As shown, the capillary tube 2′ has an inner diameter 21′ with an inner wall 22′ and has a larger diameter at the upper end than the lower end. A metal wire 3′ is inserted into the capillary tube 2′ and the lower end of the metal wire 3′ is melted to form a ball shaped member 31′ by electric spark. Then, ultrasonic vibration and pressure deformation processing are applied to the capillary tube 2′ to join the inter-metallic compounds between wire 3′ and the chip 1′ (see FIG. 1B). When the capillary tube 2′ is removed, a metal bump 32′ will be formed on the raised platform 11′ of the chip 1′ (see FIG. 1C). Thereafter; a metal or solder ball 4′ is soldered on the metal bump 32′.
However, due to the limitation of the design of the capillary tube 2′, the metal bump 32′ will have a spherical surface which is insufficient to provide a large contact area and a reliable structure for joining other component parts. Furthermore, the bottom of the metal bump 32′ will tend to go beyond the lower opening of the capillary tube 2′ under pressure thereby making it difficult to control. Moreover; as the metal bump 32′ has a spherical surface, there will not be sufficient area in contact with a metal or solder ball 4′ (see FIG. 1D). In addition, the metal bump 32′ is so short that the metal or solder ball 4′ must be soldered to the metal bump 32′ at a very low position thereby making it difficult to make the connection between the die and the fingers of a substrate (or lead frame, chips, metal bumps or the like) and therefore influencing the qualification rate of products.
Therefore, it is an object of the present invention to provide a method and device for making a metal bump with an increased height which can obviate and mitigate the above-mentioned drawbacks.
This invention is related to a method and device for making a metal bump with an increased height.
It is the primary object of the present invention to provide a method and device for making metal bumps with an increased height which can increase the joining strength with other metal bumps or pads of a die.
It is another object of the present invention to provide a method and device for making metal bumps with an increased height which can enlarge the contact area with the metal or solder ball.
It is still another object of the present invention to provide a method and device for making metal bumps with an increased height which can increase its reliability in joining with other component parts.
It is a further object of the present invention to provide a method and device for making metal bumps which have an increased height but are small in diameter.
The foregoing object and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.
Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.
FIG. 1A illustrates the lower end of the metal wire being melted to form a ball shaped member according to the prior art;
FIG. 1B illustrates the connection between the ball shaped member and the die according to the prior art;
FIG. 1C illustrates a metal bump according to the prior art;
FIG. 1D illustrates the connection between the metal bump and the metal or solder ball;
FIG. 2 is a sectional view of the capillary tube according to the present invention;
FIG. 3A illustrates how the lower end of the metal wire is melted to form a ball shaped member according to the present invention;
FIG. 3B illustrates how the lower end of the metal wire is joined with the die according to the present invention;
FIG. 3C illustrates the metal bump according to the present invention; and
FIG. 3D illustrates the connection between the metal bump and the metal or solder ball according to the present invention.
For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings. Specific language will be used to describe same. It will, nevertheless, be understood that no limitation of the scope of the invention is thereby intended, alterations and further modifications in the illustrated device, and further applications of the principles of the invention as illustrated herein being contemplated as would normally occur to one skilled in the art to which the invention relates.
Referring to the drawings and in particular to FIG. 2 thereof, the high metal bump according to the present invention is manufactured by a hard conical tubular member 20 having a vertical conical passage 21 at the upper portion, a bell shaped chamber 23 at the lower portion which is larger than the vertical conical passage 21 in diameter, and which is located under and communicated with the vertical conical passage 21, and a circular recess 231 which is larger than the bell shaped chamber 23 in diameter, and which is located under and communicated with the bell shaped chamber 23, thereby forming a capillary tube 2 with a surface 22.
During manufacture, a metal wire 3 is inserted into the conical passage 21 of the hard conical tubular member 20, with its lower end protruded down into the bell shaped chamber 23. Then, the lower end of the metal wire 3 is melted to form a ball 31. Then, the hard conical tubular member 2 is approached to a raised platform 11 formed on the top of a chip 1, and the metal wire 3 is heated and bonded on the pad of die to melt and ultrasonic energy is applied to make the melted metal fill up the bell shaped chamber 23, thereby forming a metal bump 32 on the platform 11. Thereafter, the hard conical tubular member 2 is removed to pull off the necking position between the metal wire 3 and the top of the metal bump 32 thereby leaving the metal bump 32 on the platform 11. The bottom of the metal bump 32 has a flange 321 formed by the circular recess 231 of the hard conical tubular member 2.
Because of the vertical conical passage 21, the bell shaped chamber 23 and the circular recess 231, the cross sectional area of the metal bump 32 will be restricted by the bottom area of the bell shaped chamber 23 and the metal bump 32 will have a height equal to the height 232 of the bell shaped chamber 23 thereby increasing the joining capability between the metal bump 32 and the raised platform 11 of the semiconductor chip 1 and enlarging the contact area 33 between the metal bump 32 and the metal or solder ball 4.
It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.
While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.
Claims (1)
1. A method of making metal bumps comprising the steps of:
inserting a metal wire into a conical passage of a hard conical tubular member with a lower end protruded down into a bell shaped chamber;
melting said lower end of said metal wire to form a ball shaped member;
approaching said hard conical tubular member to a raised platform formed on a top of a die;
melting said metal wire and applying ultrasonic energy to make melted metal fill up said bell shaped chamber and a circular recess thereby forming a metal bump on said raised platform; and
removing said hard conical tubular member to pull off a necking position between said metal wire and a top of said metal bump thereby leaving a metal bump on said raised platform, a bottom of said metal bump having a flange formed by said circular recess of said hard conical tubular member.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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TW90113434A TW515067B (en) | 2001-05-31 | 2001-05-31 | Metal bump having higher pillar and the fabricated device thereof |
TW090113434 | 2001-05-31 | ||
TW90113434A | 2001-05-31 |
Publications (2)
Publication Number | Publication Date |
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US20020179686A1 US20020179686A1 (en) | 2002-12-05 |
US6499648B2 true US6499648B2 (en) | 2002-12-31 |
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US09/987,497 Abandoned US20030006268A1 (en) | 2001-05-31 | 2001-11-15 | Method and device for making a metal bump with an increased height |
US09/988,097 Expired - Fee Related US6499648B2 (en) | 2001-05-31 | 2001-11-19 | Method and device for making a metal bump with an increased height |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US09/987,497 Abandoned US20030006268A1 (en) | 2001-05-31 | 2001-11-15 | Method and device for making a metal bump with an increased height |
Country Status (3)
Country | Link |
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US (2) | US20030006268A1 (en) |
DE (2) | DE10148460A1 (en) |
TW (1) | TW515067B (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050121493A1 (en) * | 2003-12-04 | 2005-06-09 | Kulicke & Soffa Investments, Inc. | Multi-part capillary |
US20050218188A1 (en) * | 2004-04-02 | 2005-10-06 | Chippac, Inc. | Wire bond capillary Tip |
US20060001157A1 (en) * | 2004-06-30 | 2006-01-05 | Carberry Patrick J | Methods and apparatus for integrated circuit ball bonding using stacked ball bumps |
US20120037687A1 (en) * | 2010-08-11 | 2012-02-16 | Fujitsu Limited | Capillary and ultrasonic transducer for ultrasonic bonding |
US20140374467A1 (en) * | 2013-06-24 | 2014-12-25 | Jia Lin Yap | Capillary bonding tool and method of forming wire bonds |
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JP4427298B2 (en) * | 2003-10-28 | 2010-03-03 | 富士通株式会社 | Multi-step bump formation method |
WO2013112205A2 (en) * | 2011-09-20 | 2013-08-01 | Orthodyne Electronics Corporation | Wire bonding tool |
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CN111584680B (en) * | 2020-04-23 | 2022-03-29 | 中国科学院上海技术物理研究所 | Method for preparing indium concave template for infrared focal plane device |
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- 2001-05-31 TW TW90113434A patent/TW515067B/en not_active IP Right Cessation
- 2001-10-01 DE DE2001148460 patent/DE10148460A1/en not_active Withdrawn
- 2001-10-01 DE DE2001148463 patent/DE10148463A1/en not_active Withdrawn
- 2001-11-15 US US09/987,497 patent/US20030006268A1/en not_active Abandoned
- 2001-11-19 US US09/988,097 patent/US6499648B2/en not_active Expired - Fee Related
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US4974767A (en) * | 1988-04-25 | 1990-12-04 | Texas Instruments Incorporated | Double cone wire bonding capillary |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050121493A1 (en) * | 2003-12-04 | 2005-06-09 | Kulicke & Soffa Investments, Inc. | Multi-part capillary |
US7249702B2 (en) * | 2003-12-04 | 2007-07-31 | Kulicke And Soffa Industries, Inc. | Multi-part capillary |
US7500590B2 (en) | 2003-12-04 | 2009-03-10 | Kulicke And Soffa Industries, Inc. | Multi-part capillary |
US20050218188A1 (en) * | 2004-04-02 | 2005-10-06 | Chippac, Inc. | Wire bond capillary Tip |
US7407080B2 (en) * | 2004-04-02 | 2008-08-05 | Chippac, Inc. | Wire bond capillary tip |
US20060001157A1 (en) * | 2004-06-30 | 2006-01-05 | Carberry Patrick J | Methods and apparatus for integrated circuit ball bonding using stacked ball bumps |
US7009305B2 (en) | 2004-06-30 | 2006-03-07 | Agere Systems Inc. | Methods and apparatus for integrated circuit ball bonding using stacked ball bumps |
US20120037687A1 (en) * | 2010-08-11 | 2012-02-16 | Fujitsu Limited | Capillary and ultrasonic transducer for ultrasonic bonding |
US20140374467A1 (en) * | 2013-06-24 | 2014-12-25 | Jia Lin Yap | Capillary bonding tool and method of forming wire bonds |
Also Published As
Publication number | Publication date |
---|---|
DE10148463A1 (en) | 2003-01-23 |
US20020179686A1 (en) | 2002-12-05 |
TW515067B (en) | 2002-12-21 |
US20030006268A1 (en) | 2003-01-09 |
DE10148460A1 (en) | 2002-12-05 |
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